The SFR licence activates the single-frequency repeater function.

A single-frequency repeater uses two time slots on a single frequency for simultaneous reception and transmission in DMR mode. It receives voice or data on one slot and transmits it on the other slot. It can implement the single-frequency repeater function by using the same frequency for both RX and TX. This function is supported only on specific firmware versions of the TM840, DP9XX and DR700 radios.

SFR Brochure (Ukrainian)